package com.zq.common.utils.file;


import com.zq.common.config.Properties.QiNiuYunProperties;
import com.zq.common.exception.file.FileNameLengthLimitExceededException;
import com.zq.common.exception.file.InvalidExtensionException;
import com.zq.common.utils.DateUtils;
import com.zq.common.utils.StringUtils;
import com.zq.common.utils.uuid.Seq;
import org.apache.commons.io.FilenameUtils;
import org.apache.tomcat.util.http.fileupload.impl.FileSizeLimitExceededException;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.multipart.MultipartFile;

import java.io.File;
import java.io.IOException;
import java.nio.file.Paths;
import java.util.HashMap;
import java.util.Map;
import java.util.Objects;

/**
 * 文件上传工具类
 *
 * @author 财哥
 */
public class FileUploadUtils
{

    @Autowired
    private static QiNiuYunProperties qiNiuYunProperties;
    /**
     * 默认大小 50M
     */
    public static final long DEFAULT_MAX_SIZE = 50 * 1024 * 1024;

    /**
     * 默认的文件名最大长度 100
     */
    public static final int DEFAULT_FILE_NAME_LENGTH = 100;



     /**
     * 文件上传
     *
     * @param baseDir 相对应用的基目录
     * @param file 上传的文件
     * @param allowedExtension 上传文件类型
     * @return 返回上传成功的文件名
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws FileNameLengthLimitExceededException 文件名太长
     * @throws IOException 比如读写文件出错时
     * @throws InvalidExtensionException 文件校验异常
     */
    public static final Map upload(MultipartFile file, String[] allowedExtension, String path)
            throws FileSizeLimitExceededException, IOException, InvalidExtensionException
    {
        int fileNameLength = Objects.requireNonNull(file.getOriginalFilename()).length();
        if (fileNameLength > FileUploadUtils.DEFAULT_FILE_NAME_LENGTH)
        {
            throw new FileNameLengthLimitExceededException(fileNameLength);
        }
        assertAllowed(file, allowedExtension);
        String fileName = extractFilename(file);
        String absPath = getAbsoluteFile(path,fileName).getAbsolutePath();
        file.transferTo(Paths.get(absPath));
        Map<String,String> result = new HashMap<String,String>();
        result.put("fileName", fileName);
        result.put("path", absPath);
        return result;

    }

    /**
     * 编码文件名
     */
    public static final String extractFilename(MultipartFile file)
    {
        return StringUtils.format("{}_{}.{}", DateUtils.datePath(), Seq.getId(Seq.uploadSeqType), getExtension(file));
    }
    /**
     *
     * @param uploadDir
     * @param fileName
     * @return
     * @throws IOException
     */
    public static final File getAbsoluteFile(String uploadDir, String fileName) throws IOException
    {
        File desc = new File(uploadDir + File.separator + fileName);

        if (!desc.exists())
        {
            if (!desc.getParentFile().exists())
            {
                desc.getParentFile().mkdirs();
            }
        }
        return desc;
    }

//    public static final String getPathFileName(String uploadDir, String fileName) throws IOException
//    {
//        int dirLastIndex = qiNiuYunProperties.getLocalPath().length() + 1;
//        return currentDir + "/" + fileName;
//    }

    /**
     * 文件大小校验
     *
     * @param file 上传的文件
     *             判断文件后缀是否合格
     * @return
     * @throws FileSizeLimitExceededException 如果超出最大大小
     * @throws InvalidExtensionException
     */
    public static final void assertAllowed(MultipartFile file, String[] allowedExtension)
            throws FileSizeLimitExceededException, InvalidExtensionException
    {
        long size = file.getSize();
        if (size > DEFAULT_MAX_SIZE)
        {
            throw new FileSizeLimitExceededException("文件过大,", 1024 , 1024);
        }

        String fileName = file.getOriginalFilename();
        String extension = getExtension(file);
        if (allowedExtension != null && !isAllowedExtension(extension, allowedExtension))
        {
            if (allowedExtension == MimeTypeUtils.IMAGE_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidImageExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.FLASH_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidFlashExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.MEDIA_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidMediaExtensionException(allowedExtension, extension,
                        fileName);
            }
            else if (allowedExtension == MimeTypeUtils.VIDEO_EXTENSION)
            {
                throw new InvalidExtensionException.InvalidVideoExtensionException(allowedExtension, extension,
                        fileName);
            }
            else
            {
                throw new InvalidExtensionException(allowedExtension, extension, fileName);
            }
        }
    }

    /**
     * 判断MIME类型是否是允许的MIME类型
     *
     * @param extension
     * @param allowedExtension
     * @return
     */
    public static final boolean isAllowedExtension(String extension, String[] allowedExtension)
    {
        for (String str : allowedExtension)
        {
            if (str.equalsIgnoreCase(extension))
            {
                return true;
            }
        }
        return false;
    }

    /**
     * 获取文件名的后缀
     *
     * @param file 表单文件
     * @return 后缀名
     */
    public static final String getExtension(MultipartFile file)
    {
        String extension = FilenameUtils.getExtension(file.getOriginalFilename());
        if (StringUtils.isEmpty(extension))
        {
            extension = MimeTypeUtils.getExtension(Objects.requireNonNull(file.getContentType()));
        }
        return extension;
    }


    /**
     * 删除指定文件
     * @param filePath 文件路径
     * @return 是否删除成功
     */
    public static Boolean deleteFile(String filePath) {
        File file = new File(filePath);
        if (file.exists()) {
            if (file.delete()) {
                System.out.println("文件删除成功！");
                return true;
            } else {
                System.out.println("文件删除失败！");
                return false;
            }
        } else {
            System.out.println("文件不存在！");
            return false;
        }
    }
}
